CN105845360A - Zero-sequence current transformer - Google Patents

Zero-sequence current transformer Download PDF

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Publication number
CN105845360A
CN105845360A CN201610286363.5A CN201610286363A CN105845360A CN 105845360 A CN105845360 A CN 105845360A CN 201610286363 A CN201610286363 A CN 201610286363A CN 105845360 A CN105845360 A CN 105845360A
Authority
CN
China
Prior art keywords
core pipe
crimp
plate portion
current transformer
core tube
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN201610286363.5A
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Chinese (zh)
Inventor
申俊
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN201610286363.5A priority Critical patent/CN105845360A/en
Publication of CN105845360A publication Critical patent/CN105845360A/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/06—Mounting, supporting or suspending transformers, reactors or choke coils not being of the signal type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L3/00—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets
    • F16L3/08—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets substantially surrounding the pipe, cable or protective tubing
    • F16L3/10—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets substantially surrounding the pipe, cable or protective tubing divided, i.e. with two or more members engaging the pipe, cable or protective tubing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
    • G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H01F27/402—Association of measuring or protective means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20—Instruments transformers
    • H01F38/22—Instruments transformers for single phase ac
    • H01F38/28—Current transformers
    • H01F38/30—Constructions
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G7/00—Overhead installations of electric lines or cables
    • H02G7/04—Arrangements or devices for relieving mechanical tension
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H01F27/402—Association of measuring or protective means
    • H01F2027/406—Temperature sensor or protection

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

The invention discloses a zero-sequence current transformer, which comprises a core tube, a current transformer body, two sets of press claw components, two flat nuts and six crimping parts, wherein six radial limiting slide holes are formed in the tube wall of the core tube; each crimping part is provided with a press plate part and an anti-drop connection part; the crimping parts are detachably arranged on the core tube through the anti-drop connection parts respectively; each set of press claw components comprise three press claws; each press claw comprises a top plate part, a guide slide block part and a drive thread part; each guide slide block part is inserted into one corresponding radial limiting slide hole in the core tube; the drive thread parts extend into a tube cavity of the core tube; the flat nuts are rotationally arranged in the tube cavity of the core tube; each flat nut comprises a plane thread part; the current transformer body comprises an annular base body; and a mounting screw hole of a built-in temperature sensing device is formed in at least one crimping part. The zero-sequence current transformer has a real-time temperature monitoring function.

Description

A kind of zero sequence current mutual inductor
Technical field
The invention belongs to technical field of electric power, be specifically related to a kind of zero sequence current mutual inductor.
Background technology
The ultimate principle of zero-sequence current protection is based on Kirchhoff's current law (KCL): flow into the telegram in reply of any node in circuit The algebraical sum of stream is equal to zero.In the case of circuit and electrical equipment are normal, the vector of each phase current is equal to zero, therefore, zero The secondary side winding no signal output of sequence current transformer, executive component is failure to actuate.When occurring to get an electric shock or each during leak current fault The vector of phase current is not zero, and fault current makes to produce in the iron core of zero sequence current mutual inductor magnetic flux, zero sequence current mutual inductor Produced electric current is zero-sequence current.When protection mechanism receives this zero sequence current signal, can take accordingly according to electrical leakage quantity Protection act.Mostly the mounting means of existing zero sequence current mutual inductor is to use flange install fixing or use bonding mode solid Fixed, its installation site is it is generally required to reserve, therefore makes its application by more restriction.
Summary of the invention
It is an object of the invention to provide and a kind of be easily installed location and to have the zero-sequence current of real time temperature control function mutual Sensor.
The technical scheme realizing the object of the invention is: a kind of zero sequence current mutual inductor, mutual including a core pipe, an electric current Sensor, two casing pressure claw assemblies, two plane nuts and six crimps；The tube wall of core pipe is provided with six spacing slide openings of radial direction； Each crimp is provided with pressing plate portion and anticreep connecting portion；Each crimp is arranged on core pipe by anticreep connecting portion is dismountable, pressure Plate portion is positioned at outside core pipe；Each casing pressure claw assembly includes three paws；Each paw includes top plate portion, inside from the inwall of top plate portion Protrude the guide runner portion formed and the driving threaded portion being arranged in guide runner portion；Top plate portion is positioned at outside core pipe, top board The pressing plate portion clamping of portion and a corresponding crimp forms one for the clamp hole clamping electric power cable；Guide runner portion inserts On core pipe in a corresponding spacing slide opening of radial direction, threaded portion is driven to stretch in the tube chamber of core pipe；Each plane nut rotation is arranged In core pipe tube chamber；Each plane nut includes engaging the plane of adaptation with the threaded portion that drives of paw in corresponding a set of paw assembly Threaded portion；Current transformer includes that annular matrix, clamp hole are positioned in the vestibule of annular matrix；At least one crimp is provided with The installation screw in pressing plate portion is extended radially through along core pipe；This installation screw is fixed with a temperature sensing device.
Temperature sensing device is provided with as puncturing the heat conduction boss used close to one end of core tube hub axis.
The present invention has a positive effect: the zero sequence current mutual inductor of (1) present invention owing to carrying press claw type retaining mechanism, Can directly be fixedly installed on cable, it is not necessary to reserved installation position, it is easy to install, and there is preferable anti-loosening effect, firmly Intensity is relatively high and stable reliably.(2) present invention compares with by traditional bolt assembly clamping electric power cable, can apply bigger Pressure, and there is the anti-loosening effect of excellence, the reliability of long-term work is effectively ensured.(3) present invention uses two casing pressures Claw assembly is clamped on same cable, has the effect of dual fail-safe, in use goes wrong even if the most a set of, also has another Set ensures its service behaviour.(4) it is provided with the installation screw of built-in temperature sensing device due at least one crimp, therefore also has Real time temperature control function.
Accompanying drawing explanation
Fig. 1 is a kind of perspective view of the first structure of the present invention；
Fig. 2 is a kind of front view of zero sequence current mutual inductor shown in Fig. 1；
Fig. 3 is that shown in Fig. 1, the one of zero sequence current mutual inductor partly cuts open structural representation；
Fig. 4 is a kind of perspective view after zero sequence current mutual inductor shown in Fig. 1 removes current transformer；
Fig. 5 is a kind of front view of zero sequence current mutual inductor shown in Fig. 4；
Fig. 6 is that shown in Fig. 4, the one of zero sequence current mutual inductor partly cuts open structural representation；
Fig. 7 is a kind of explosive view of zero sequence current mutual inductor shown in Fig. 4.
Fig. 8 is that the one of the second structure of the present invention partly cuts open structural representation；
Fig. 9 is the close-up schematic view in Fig. 8 at B；
Figure 10 is that one when removing current transformer of the zero sequence current mutual inductor shown in Fig. 8 partly cuts open structural representation.
Detailed description of the invention
(embodiment 1)
The present embodiment is a kind of zero sequence current mutual inductor, as shown in Fig. 1 to Fig. 7, including a core pipe 2, two casing pressure claw assembly 3, Two plane nut 4, two set crimp assemblies and a current transformer 9.
The tube wall of core pipe is provided with six spacing slide openings of radial direction 22, and each radially spacing slide opening all extends radially through core along core pipe Tube wall；Each radially spacing slide opening be positioned at core pipe axially on middle part, the radial cross-sectional shape of each radially spacing hole is I-shaped； The internal perisporium of core pipe is provided with the annular gear platform 23 of inwardly projecting formation.In the present embodiment, six radial direction spacing holes are divided into two groups, In each group three radially spacing hole is for adaptive with corresponding a set of paw assembly.
Each set crimp assemblies is for adaptive with corresponding a set of paw assembly, and each set crimp assemblies all includes three crimps 1； Each crimp is provided with pressing plate portion 11 and anticreep connecting portion 12；Crimp is arranged on core pipe by anticreep connecting portion is dismountable； Pressing plate portion 11 is axially extending along core pipe, and the inwall in pressing plate portion is provided with arcuate groove 13, and the periphery wall in pressing plate portion is circular arc；Anticreep is even The portion of connecing is two the post plates protruding inwardly from formation from pressing plate portion two side ends, and each post plate is axially extending along core pipe, the radial direction of each post plate Cross sectional shape is L-shaped；In the present embodiment, two L-shaped post plates are oppositely arranged；
Three it are provided with vertically for the anticreep chute 24 installing location crimp on the periphery wall of core pipe；Each anticreep chute includes Two radial sections are the mounting grooves 241 of L-shaped；In the present embodiment, two adjacent anticreep chutes are oppositely arranged；Each mounting groove and A corresponding post plate is adaptive；The anticreep connecting portion of each crimp slips into along core pipe axial direction from a side of anticreep chute accordingly In one anticreep chute；In concrete practice, anticreep connecting portion can select other shape, as long as making the anticreep of crimp Connecting portion can not remove along core caliber to from anticreep chute；In concrete practice, it is possible to select the mode of clamping to install Fixing crimp；Multiple draw-in groove is such as set on the periphery wall of core pipe, each pressing plate arranges the clamping protruded inwardly from and supports Post or clamping gripper shoe, directly snap in each clamping support column or clamping gripper shoe in a corresponding draw-in groove, also can prevent clamping Part removes core pipe along core pipe radial direction, and this structure is also feasible.
The inwall of a corresponding crimp is just arranged by each radially spacing slide opening.
In concrete practice, also two crimps axially adjacent along core pipe can be made of one part, then in the present embodiment Two set crimp assemblies just unite two into one and become a set of crimp assemblies.
Each casing pressure claw assembly includes three paws 5 for forming clamp hole with crimp combination；Each paw includes top board Portion 51, from the guide runner portion 52 of the inwardly projecting formation of the inwall of top plate portion and the driving threaded portion that is arranged on guide runner portion 53；Top plate portion is axially extending along core pipe, and guide runner portion radially extends along core pipe；The outer wall of paw top plate portion is provided with arc folder Groove 511；Each paw top plate portion is positioned at outside core pipe, and just arranges the pressing plate portion of a corresponding crimp；Each guide runner portion Insert on core pipe in a corresponding spacing slide opening of radial direction, in each tube chamber driving threaded portion to stretch to core pipe；Each paw is radially Under the guide and limit effect of spacing slide opening, the radial direction along core pipe reciprocatingly slides；The radial cross-sectional shape in each guide runner portion is and footpath To adaptive I-shaped of spacing hole.
In the present embodiment, the arcuate groove of a corresponding crimping boss is just arranged by the arc clip slot of each paw, and this paw Arc clip slot and this crimping boss arcuate groove clamping formed a clamp hole 6, described clamp hole is provided with for increase hold The thread groove of power；Each clamp hole is for one electric power cable of clamping；The present embodiment forms three clamp holes, altogether three electricity of clamping altogether Line of force cable.Current transformer 9 includes annular matrix 91 and intelligent control module 92, and intelligent control module can include wireless receiving and dispatching Unit, when having leakage current in three electric power cables, annular matrix will induce secondary current, and intelligent control module passes through nothing Line Transmit-Receive Unit sends distance host to this secondary current information；Annular matrix and core pipe are arranged concentrically, and annular matrix is positioned at The outside of crimp；Intelligent control module is arranged on to be enclosed by annular matrix inwall, core tube wall and crimp outer wall and is formed In region, thus make full use of space, be conducive to the small-sized and integrated of entirety.
Two plane nut rotations are arranged in core pipe tube chamber, and are positioned at the both sides of annular gear platform；Each plane nut includes Engage the flat thread portion 41 of adaptation with the threaded portion that drives of paw in corresponding a set of paw assembly and be positioned in plane nut Fastening part 42 at the heart；Each plane nut adjoins the flat thread portion that arranges on a side of paw assembly, each plane nut another One side and core pipe gear platform slide adjacent；The periphery wall of each plane nut and core inside pipe wall slide adjacent；Flat thread portion is ring Shape, flat thread portion is provided with archimedean spiral groove, and the driving threaded portion of paw assembly is provided with and this Archimedian screw The thread groove that groove is adaptive, each side driving threaded portion to be arranged on guide runner portion, place adjacent flat nut.
In the present embodiment, the fastening part of each plane nut is interior hexagonal shape fastener hole or interior hexagonal shape binding groove, and it twists behaviour Make to use inner hexagon spanner；In concrete practice, described fastening part just can use other shape, the most square or in-line or prunus mume (sieb.) sieb.et zucc. Flower-shape, all can select.
Each plane nut, in reciprocating rotation, drives its flat thread portion reciprocating rotation, and then by engaging adaptation The threaded portion that drives drive the paw in corresponding a set of paw assembly, owing to each paw is made at the guide and limit of radially spacing slide opening Under with, the radial direction only along core pipe moves back and forth so that in corresponding a set of paw assembly the move mode of paw be towards Core tube hub close to each other or away from, thus unclamp or clamp the electric power cable being positioned in clamp hole.
When the present embodiment is on the overhead power line of high-altitude, be conducive to alleviating vibration；It addition, the present embodiment passes through plane Threaded portion drives paw clamping electric power cable, compares, in anti-loosening effect with by traditional bolt assembly clamping electric power cable On particularly excellent, the reliability of long-term work is effectively ensured.Additionally, due to crimp is to be pacified by sliding or crimping mode It is contained on core pipe, can first cable be placed in the arc clip slot of each paw, more corresponding crimp is loaded corresponding anticreep In chute, corresponding electric power cable can be placed in clamp hole；This structure make clamp electric power cable easy and simple to handle easily OK.Finally, due to the fact that and have employed two casing pressure claw assemblies for clamping electric power cable, also there is the technique effect of dual fail-safe.
The present embodiment entirety can use as high pressure zero sequence current mutual inductor, for detecting the existence of leakage current, and Shi Faxian leak current fault.
(embodiment 2)
The present embodiment and above-described embodiment 1 are essentially identical, and difference is: as shown in Fig. 8 to Figure 10, in the present embodiment, and intelligence The monnolithic case of energy control module is also annular；Toroidal inductive body 91 and intelligent control module 92 are set in crimp side by side On periphery wall.
At least one crimp 1 is provided with the installation screw 15 extending radially through pressing plate portion along core pipe；This installation screw is fixed It is provided with a temperature sensing device 8.
Temperature sensing device 8 includes the metal shell 81 with storage tank 811 that metal material makes, is arranged on storage tank In temperature sensor 82, the spring 83 for temperature sensor is crimped on storage tank diapire, the spiral shell that is used for limit spring Pipe plug 84.
Metal shell is provided with as puncturing the heat conduction boss 813 used, metal-back close to one end 812 of core tube hub axis Body is provided with interior hexagonal away from one end 814 of core tube hub axis and twists groove 815；The periphery wall of metal shell is provided with and installs spiral shell The external screw thread 816 that hole is adaptive, the internal perisporium of storage tank is provided with internal threaded regions 817；Heat conduction boss is close to core from metal shell The sharp tooth boss formed is protruded in one end 812 of tube hub axis.
Temperature sensor includes using the heat-conducting block 821 that heat conductive insulating elastomeric material is made, the U-shaped being arranged in heat-conducting block Thermo-sensitive resistor 822, two be arranged on heat-conducting block connect electric mortiser post 823；Heat-conducting block can be reciprocal in the storage tank of metal shell Slide；Heat-conducting block is connected on the diapire of storage tank close to one end of core tube hub axis；Two connect electric mortiser post protrusion and are arranged on On the heat-conducting block other end away from core tube hub axis.
Heat-conducting block encloses formation annular between outer wall and the internal perisporium of storage tank away from the other end of core tube hub axis Groove 100, spring is positioned in this cannelure and is set on heat-conducting block one end away from core tube hub axis.
Screwed pipe plug is provided with external screw thread district 841 close to the periphery wall of one end of core tube hub axis, this external screw thread district and The internal threaded regions 817 of metal shell is adaptive；Screwed pipe plug is provided with outer-hexagonal away from the periphery wall of one end of core tube hub axis Twist portion 842；The center of screwed pipe plug is provided with tube chamber 843；Screwed pipe plug is fixedly installed on cannelure by its external screw thread district In.
Spring is connected on heat-conducting block close to one end of core tube hub axis, and spring is away from the other end of core tube hub axis It is connected on screwed pipe plug；On heat-conducting block two connect electric mortiser post and are positioned in the tube chamber 843 of screwed pipe plug.
This structure has the following advantages, owing to metal shell is easily deformed when extruding cable, and extrusion temperature sensor Heat-conducting block, if heat-conducting block does not has mobile space, then easily pressurized deformation damages；The present embodiment, can by arranging spring Heat-conducting block is crimped on the diapire of metal shell storage tank so that it is can correctly predict cable and junction, pressing plate pressing plate portion Real time temperature；Can also be when, after metal shell compressive deformation, reserving mobile space to heat-conducting block, thus prevent heat-conducting block by pressurized Damage；This structure has preferably Practical Performance.
In concrete practice, an installation screw can be respectively provided with on each crimp and one be built in this installation screw In temperature sensing device, for each cable and and the temperature of crimp junction monitor in real time, thus realize It is further intelligent that power network monitoring runs.
The internal perisporium of intelligent control module 92 is provided with inwardly projecting two and connects electric bushing (being not drawn on figure), respectively connects electricity Socket inserts corresponding one and connects in electric bushing, so that temperature sensor is connected with the middle control circuit in intelligent control module.
The present embodiment can be used in clamping three phase cables, and now the present embodiment entirety can be mutual as high pressure zero-sequence current Sensor uses, for detecting the existence of leakage current, to find leak current fault in time.
Obviously, the above embodiment of the present invention is only for clearly demonstrating example of the present invention, and is not right The restriction of embodiments of the present invention.For those of ordinary skill in the field, the most also may be used To make other changes in different forms.Here without also cannot all of embodiment be given exhaustive.And these Belong to obvious change that the connotation of the present invention extended out or variation still falls within protection scope of the present invention.

Claims (2)

1. a zero sequence current mutual inductor, it is characterised in that: include a core pipe, current transformer, two casing pressure claw assemblies, Two plane nuts and six crimps；The tube wall of core pipe is provided with six spacing slide openings of radial direction；Each crimp is provided with pressing plate portion With anticreep connecting portion；Each crimp is arranged on core pipe by anticreep connecting portion is dismountable, and pressing plate portion is positioned at outside core pipe；Respectively Casing pressure claw assembly includes three paws；Each paw includes top plate portion, guide runner from the inwardly projecting formation of the inwall of top plate portion Portion and the driving threaded portion being arranged in guide runner portion；Top plate portion is positioned at outside core pipe, top plate portion and a corresponding crimp Pressing plate portion clamping form one for the clamp hole clamping electric power cable；Guide runner portion inserts a corresponding radial direction on core pipe In spacing slide opening, threaded portion is driven to stretch in the tube chamber of core pipe；Each plane nut rotation is arranged in core pipe tube chamber；Each plane Nut includes engaging the flat thread portion of adaptation with the threaded portion that drives of paw in corresponding a set of paw assembly；Current transformer bag Including annular matrix, clamp hole is positioned in the vestibule of annular matrix；At least one crimp is provided with and extends radially through pressing plate along core pipe The installation screw in portion；This installation screw is fixed with a temperature sensing device.
Zero sequence current mutual inductor the most according to claim 1, it is characterised in that: temperature sensing device is close to core tube hub axle One end of line is provided with as puncturing the heat conduction boss used.
CN201610286363.5A 2016-05-02 2016-05-02 Zero-sequence current transformer Withdrawn CN105845360A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610286363.5A CN105845360A (en) 2016-05-02 2016-05-02 Zero-sequence current transformer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610286363.5A CN105845360A (en) 2016-05-02 2016-05-02 Zero-sequence current transformer

Publications (1)

Publication Number Publication Date
CN105845360A true CN105845360A (en) 2016-08-10

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Family Applications (1)

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CN201610286363.5A Withdrawn CN105845360A (en) 2016-05-02 2016-05-02 Zero-sequence current transformer

Country Status (1)

Country Link
CN (1) CN105845360A (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1319448A2 (en) * 2001-12-11 2003-06-18 Mario Fabris Two stage clamping pinion
CN2793486Y (en) * 2005-03-28 2006-07-05 郑春开 Clasp cable device
CN202917711U (en) * 2012-11-13 2013-05-01 北京振兴计量测试研究所 Fastening fixture for tail cover of electric connector
CN204724882U (en) * 2015-06-01 2015-10-28 冯炯培 A kind of three-jaw clamping device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1319448A2 (en) * 2001-12-11 2003-06-18 Mario Fabris Two stage clamping pinion
CN2793486Y (en) * 2005-03-28 2006-07-05 郑春开 Clasp cable device
CN202917711U (en) * 2012-11-13 2013-05-01 北京振兴计量测试研究所 Fastening fixture for tail cover of electric connector
CN204724882U (en) * 2015-06-01 2015-10-28 冯炯培 A kind of three-jaw clamping device

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Application publication date: 20160810